I neved had any bad experience with them..
I have ordered couple of times through BRU and TRU. I have always had fast delivery and no hassles. But I never had to return anything or order something from a registry. So I can't share anything in that department.
We once ordered an outdoor playset from TRU and it was a large order but the delivery was perfect and on time.
Never any problems returning...
I think it depends on the individual store... I just had a baby 4 months ago and have made about 10 returns to Target and about 20 to BRU without a reciept, just a copy of my registry. Every time, they just put the full amount on a gift card and said "here ya go". No problems at all. Yes they ask for my registry print out and ID, but no hassle at all.